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United States Patent | 6,049,998 |
Crouse ,   et al. | April 18, 2000 |
A papermaking machine has a heated Extended Nip press following the pressing section. High temperature pressing raises the exit solids out of the press to 55 to 65 percent. The web then enters a high intensity dryer section where the web is pressed onto a dryer roll in intimate contact with the roll where it is dried up to approximately 90 percent solids. A coating on the dryer roll and the Extended Nip backing roll is composed of ceramic, metal and a fluorocarbon to allow the web to be separated from the backing roll and the dryer roll with ease. The dryer roll is internally heated by steam or preferably gas to between 200.degree. F. and 500.degree. F. An aircap positioned over the web on the dryer blows hot air at a temperature of 200-500.degree. F. at a velocity of 15,000 to 30,000 feet per minute onto the web.
Inventors: | Crouse; Jere W. (Beloit, WI); Lenling; William J. (Madison, WI) |
Assignee: | Beloit Technologies Inc. (Wilmington, DE) |
Appl. No.: | 966830 |
Filed: | November 10, 1997 |
Current U.S. Class: | 34/445; 34/122 |
Intern'l Class: | F26B 003/04 |
Field of Search: | 34/419,425,443,444,445,114,116,117,120,122 162/206,207,208 |
4874469 | Oct., 1989 | Pulowski et al. | 162/358. |
4880502 | Nov., 1989 | Wedel | 162/358. |
5127168 | Jul., 1992 | Pikulik | 34/423. |
5439559 | Aug., 1995 | Crouse | 162/358. |
5542192 | Aug., 1996 | Deshpande et al. | 34/115. |
5653041 | Aug., 1997 | Ilmarinen et al. | 34/117. |
5678321 | Oct., 1997 | Deshpande et al. | 34/115. |
Foreign Patent Documents | |||
289447A | Nov., 1988 | EP. | |
195 48 747 A1 | Jul., 1997 | DE. |